Here is the full list of all 16 Raid Healing achievements.
Successfully defeat all waves of enemies in a tier 1 area in Normal game mode.
Successfully defeat all waves of enemies in a tier 5 area in Normal game mode.
Successfully defeat all waves of enemies in a tier 10 area in Normal game mode.
Successfully defeat all waves of enemies in a tier 15 area in Normal game mode.
Successfully defeat all waves of enemies in a tier 20 area in Normal game mode.
Successfully defeat all waves of enemies in a tier 25 area in Normal game mode.
Successfully defeat all waves of enemies in a tier 30 area in Normal game mode.
Successfully defeat all waves of enemies in a tier 35 area in Normal game mode.
Successfully defeat all waves of enemies in a tier 1 area in Hardcore game mode.
Successfully defeat all waves of enemies in a tier 5 area in Hardcore game mode.
Successfully defeat all waves of enemies in a tier 10 area in Hardcore game mode.
Successfully defeat all waves of enemies in a tier 15 area in Hardcore game mode.
Successfully defeat all waves of enemies in a tier 20 area in Hardcore game mode.
Successfully defeat all waves of enemies in a tier 25 area in Hardcore game mode.
Successfully defeat all waves of enemies in a tier 30 area in Hardcore game mode.
Successfully defeat all waves of enemies in a tier 35 area in Hardcore game mode.